Adjustable exercise bench



FIG. 1 is a side elevational view of an adjustable exercise bench showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof; and

FIG. 5 is a front elevational view thereof. 

The ornamental design for an adjustable exercise bench, as shown and described. 